语法高亮/着色猫 [英] Syntax highlighting/colorizing cat

问题描述

是否有一种方法可以像 grep 那样为 cat 的输出着色.

Is there a method to colorize the output of cat, the way grep does.

对于grep，在大多数控制台中，它会显示突出显示搜索关键字的彩色输出.否则，您可以通过调用 grep --color 来强制它有没有一种通用的方法可以根据您的个人选择为任何程序的输出着色.

For grep, in most consoles it displays a colored output highlighting the searched keywords. Otherwise, you can force it by calling grep --color Is there a generic way to color the output of any program according to your personal choice.

据我所知，程序本身不对颜色负责.它是外壳.

From what I understand, the program itself is not responsible for the colors. It is the shell.

我使用的是 FreeBSD 5.2.1 中的默认 shell，它看起来自 epoch 以来从未见过颜色.

I am using the default shell in FreeBSD 5.2.1 which looks like it has never seen colors since epoch.

推荐答案

cat 语法高亮只是超出了范围.cat 不是为了这个.如果您只想以某种方式为某个文件的整个内容着色(整个文件的颜色相同)，您可以使用终端转义序列来控制颜色.

cat with syntax highlighting is simply out of scope. cat is not meant for that. If you just want to have the entire content of some file coloured in some way (with the same colour for the whole file), you can make use of terminal escape sequences to control the color.

这是一个示例脚本，它将根据文件类型选择颜色(您可以使用类似的方法而不是直接调用 cat):

Here's a sample script that will choose the colour based on the file type (you can use something like this instead of invoking cat directly):

#!/bin/bash
fileType="$(file "$1" | grep -o 'text')"
if [ "$fileType" == 'text' ]; then
    echo -en "\033[1m"
else
    echo -en "\033[31m"
fi
cat $1
echo -en "\033[0m"

以上(在支持这些转义序列的终端上)会将任何文本文件打印为粗体"，并将任何二进制文件打印为红色.您可以使用 strings 而不是 cat 来打印二进制文件，并且您可以增强逻辑以使其适合您的需要.

The above (on a terminal that supports those escape sequences) will print any text file as 'bold', and will print any binary file as red. You can use strings instead of cat for printing binary files and you can enhance the logic to make it suit your needs.

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